Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/16—Discovering, processing access restriction or access information
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
  • H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W48/00—Access restriction; Network selection; Access point selection
  • H04W48/20—Selecting an access point
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W84/00—Network topologies
  • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
  • H04W84/10—Small scale networks; Flat hierarchical networks
  • H04W84/12—WLAN [Wireless Local Area Networks]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/08—Access point devices

Definitions

• the present invention relates to a system and method for wireless communications, and, in particular embodiments, to a system and method for providing common attributes in homogeneous extended service set identification (HESSID) and the associated queries.
• HESSID homogeneous extended service set identification
• STAs may attach to Wi-Fi access points (APs) in order to connect to wireless local area networks (WLANs).
• APs Wi-Fi access points
• WLANs wireless local area networks
• a STA may determine capabilities/attributes of a Wi-Fi AP through Access Network Query Protocol (ANQP) discovery.
• ANQP Access Network Query Protocol
• Conventional ANQP discovery techniques allow STAs to retrieve discovery information that is specific to a responding AP.
• Wi-Fi hotspots may include multiple APs that share at least some similar capabilities/attributes. Accordingly, techniques for allowing STAs to efficiently determine discovery information that is common to multiple APs in a Wi-Fi hotspot are desired.
• ANQP Access Management Protocol
• GAS Generic Advertisement Service
• BSSID Association Message Exchange BSS Identification
• PAME-BI Association Message Exchange BSS Identification
• the method further includes setting a PAME-BI bit of the GAS request to a first value if the ANQP request is querying independent BSS parameters in addition to the dependent BSS parameters and sending the GAS request to the responding ST A.
• An apparatus for performing this method is also provided.
• the method further includes setting the PAME-BI bit of the ANQP request to a first value if the ANQP request is querying independent BSS parameters in addition to the dependent BSS parameters and sending the ANQP request to the responding STA.
• BSSID BSS Identification
• PAME-BI PAME-BI bit
• FIG. 1 illustrates a diagram of a wireless network for communicating data
• FIG. 3 illustrates a diagram of a network architecture for supporting an embodiment ANQP discovery technique
• FIG. 7 illustrates a diagram of a GAS Initial Request frame body format
• FIG. 8 illustrates a diagram of a GAS Initial Response frame body format
• FIG. 10 illustrates a diagram of an advertisement protocol tuple field
• FIG. 11 illustrates a diagram of an embodiment Query Response Information field format
• FIG. 13 illustrates a block diagram of an embodiment communications device
• FIG. 14 illustrates a block diagram of an embodiment computing platform.
• WLANs are networks operating in accordance with the institute of Electrical and Electronics Engineers (IEEE) standard 802.11-2012, which is incorporated herein by reference as if reproduced in its entirety.
• Hotspot 2.0 Release 2 Technical Specs may also include information related to this disclosure, and is hereby incorporated by reference as if reproduced in its entirety.
• each Wi-Fi AP is assigned a basic service set (BSS) identifier (BSSID), which is used to uniquely identify the Wi-Fi AP during, inter alia, ANQP discovery.
• BSS basic service set
• ANQP discovery techniques return dependent BSS parameters that are specifically associated with a BSSID of a single candidate AP. More specifically, a roaming STA may detect a beacon specifying a BSSID of a candidate AP, and thereafter send an ANQP query specifying the BSSID to the candidate AP.
• the ANQP query is typically encapsulated within a Generic Advertisement Service (GAS) request frame, which is a generic container used to transport higher-layer advertisements prior to mobile station authentication.
• GAS Generic Advertisement Service
• the ANQP query may be forwarded to an ANQP server, which may return an ANQP response listing a set of dependent BSS parameters specifically associated with the BSSID of the candidate AP.
• the ANQP response may be forwarded to the STA via a GAS response message, thereby notifying the STA of the dependent BSS parameters.
• Some Wi-Fi hotspots include multiple APs that share common BSS parameters, which are referred to as independent BSS parameters.
• two or more APs may be interconnected to form an extended service set (ESS), and consequently may have the same security/network capabilities and/or attributes.
• two or more neighboring APs may share one or more common attributes when they are operated by the same network access provider (NAP) or manufactured by the same vendor.
• NWAP network access provider
• Conventional ANQP allows STAs to query dependent BSS parameters associated with a single BSSID, but does not allow STAs to specifically request/identify independent BSS parameters that are common to multiple APs to more efficiently discover common AP attributes as well as to reduce overhead in subsequent ANQP discovery exchanges.
• a ST A that learns of independent BSS parameters during an earlier ANQP exchange may be able to query fewer BSS parameters in subsequent ANQP exchanges, or to otherwise avoid one or more subsequent ANQP exchanges altogether (e.g., if the STA is only concerned with verifying that the neighboring APs have a BSS parameter included in or excluded from the list of independent BSS parameters. Accordingly, mechanisms for querying independent BSS parameters during ANQP discovery are desired.
• a requesting STA may set the PAME-BI bit in a GAS request message to a first value (e.g., zero) to indicate that the accompanying ANQP query is requesting both independent and dependent BSS parameters.
• the PAME-BI bit can be set to a second value (e.g., one) to indicate that the ANQP query is requesting only dependent BSS parameters.
• the PAME-BI bit is included as a field in the ANQP query, rather than the GAS request message.
• FIG. 1 illustrates a network 100 for communicating data.
• the network 100 comprises an access point (AP) 110 having a coverage area 112, a plurality of stations (STAs) 120, and a backhaul network 130.
• the AP 110 may comprise any component capable of providing wireless access by, inter alia, establishing uplink (dashed line) and/or downlink (dotted line) connections with the STAs 120, such as a base station, an enhanced base station (eNB), a femtocell, and other wirelessly enabled devices.
• the STAs 120 may comprise any component capable of establishing a wireless connection with the AP 110.
• the backhaul network 130 may be any component or collection of components that allow data to be exchanged between the AP 110 and a remote end (not shown).
• the network 100 may comprise various other wireless devices, such as relays, femtocells, etc.
• FIG. 2 illustrates a network 200 comprising APs 210-230 configured to provide wireless access in a coverage area 202.
• the APs 210, 220, 230 are assigned BSSID_1, BSSID_2, and BSSID 3.
• the APs 210, 220, 230 share at least some common attributes/capabilities, and as a result, one or more independent BSS parameters may be collectively associated with the
• the STA 240 is configured to perform conventional ANQP discovery, and therefore must execute separate ANQP discovery exchanges 215, 225, 235 with each of the APs 210, 220, 230 (respectively) in order to determine their respective dependent BSS parameters. Performing multiple ANQP discovery exchanges may be duplicative and/or unnecessary in situations where the APs 210-230 share large numbers of independent BSS parameters.
• the independent BSS parameters may be separate from the dependent BSS parameters.
• the dependent BSS parameters may describe those attributes that are associated with a specific BSSID, but that are not associated with the other BSSIDs.
• independent BSS parameters may be a subset of dependent BSS parameters in the sense that a subset of the BSS dependent parameters have the same values for multiple BSS.
• a set of dependent BSS attributes may define all attributes associated with a given BSSID, and the independent BSS attributes may indicate which of the dependent BSS attributes are commonly associated with all BSSIDs in the group.
• the STA 340 is configured to perform an embodiment ANQP discovery exchange 345 to obtain independent BSS parameters describing common attributes/capabilities shared between the APs 310, 320, 330.
• the ANQP discovery exchange 345 is achieved by encapsulating an ANQP query specifying BSSID 2 within a GAS initial request message.
• a PAME-BI bit of the GAS message is set to a value (e.g., zero) to indicate that the accompanying ANQP query is requesting independent BSS parameters in addition to dependent BSS parameters.
• the AP 320 relays the ANQP query to the ANQP server 305, which provides dependent and independent BSS parameters in an ANQP response message.
• the ANQP response message is forwarded to the requesting STA 340 via a GAS response message.
• FIG. 4 illustrates a network architecture 400 for performing an Access Network Query Protocol (ANQP) operation.
• ANQP Access Network Query Protocol
• STAs wanting to connect to a Wi-Fi network may scan an area for available Wi-Fi APs by, inter alia, detecting beacons and/or exchanging probe request/response messages. Once identified, the STA and Wi-Fi APs may exchange ANQP query requests and responses so that the STA may discover different features of the Wi-Fi APs.
• STAs may include any wirelessly enabled device, such as a cell phone, laptop, tablet, smart sensor, handheld or consumer electronic device, and other user devices.
• STAs may comprise a Wi-Fi interface for accessing Wi-Fi networks, as well as other interfaces for interacting with other types of communication networks, such as a cellular network.
• An access point (AP) and one or more STAs can form a basic service set (BSS), which is the basic building block of an IEEE 802.11 wireless local area network (WLAN).
• An AP may communicate with an AP controller or an ANQP server, which can be collocated or not with the AP.
• a BSS generally can be identified by a service set identifier (SSID), which is configured and may be broadcasted by the AP.
• a BSS also is identified by the BSSID, which is the MAC address of the AP.
• a SSID could be shared by several BSS, but the BSSID is unique for a BSS.
• FIG. 5 illustrates an embodiment GAS message exchange 500 between a requesting STA 510, a responding STA 520, and an ANQP server 530.
• the requesting STA sends a GAS initial request to the responding STA 520.
• the GAS initial request may include an ANQP query that specifies a BSSID and a PAM-BI bit that may indicate whether the ANQP query is requesting independent.
• the ANQP query may be forwarded from the responding STA 520 to the ANQP server 530 via another transport protocol.
• the ANQP server 530 may respond with an ANQP response message that lists dependent BSS parameters associated with the BSS ID specified by the ANQP query.
• step 620 the requesting STA generates an ANQP query specifying the
• step 630 the requesting STA encapsulates the ANQP query within a GAS request message.
• step 640 the requesting ST A elects whether to query independent BSS parameters. If the ST A elects not to query independent BSS parameters, then the method 600 proceeds to step 650, where the STA sets a PAME-BI bit of the GAS request message to zero. Alternatively, if the STA decides to query independent BSS parameters, the method 600 proceeds to step 655, where the STA sets the PAME-BI bit of the GAS request message to one.
• step 650 or step 655 the method proceeds to step 660, where the requesting STA communicates the GAS request message to a responding STA.
• the Pre- Association Message Exchange BSSID Independent (PAME-BI) bit is traditionally used by an access point (AP) to indicate whether the Advertisement Server, which is the non-AP station' s's peer for this Advertisement Protocol, returns a Query Response that is independent of the BSSID used for the Generic Advertisement Service (GAS) frame exchange.
• AP access point
• GAS Generic Advertisement Service
• GAS may be used to enable network selection for stations (STAs) when the parameter
• GAS provides transport mechanisms for advertisement services while STAs are in the unassociated state as well as the associated state.
• GAS messages are transmitted using individually addressed Public Action frames.
• a GAS message exchange may take place between two STAs, with one STA transmitting a GAS Query
• STAs may refer to mobile devices, APs, or any other device that communicates wirelessly in a Wi-Fi network.
• the GAS Initial Request frame is a Public Action frame. It is transmitted by a requesting STA to request information from another STA.
• FIG. 7 illustrates a GAS Initial
• the GAS Initial Response frame is a Public Action frame. It is transmitted by a STA responding to a GAS Initial Request frame.
• FIG. 8 illustrates a GAS Initial
• Advertisement Protocol elements contain information identifying a particular advertisement protocol and its corresponding Advertisement Control.
• FIG. 9 illustrates an Advertisement Protocol element format that includes an element ID field, a length field, and one or more advertisement protocol tuple fields.
• FIG. 10 illustrates an advertisement protocol tuple field format that includes query response information field and an advertisement protocol ID field.
• FIG. 11 illustrates a Query Response Information field format that includes a query response length limit field and a PAME-BI field.
• the PAME-BI field may be set to zero or one depending on whether independent BSS parameters are being queried.
• the Pre- Association Message Exchange BSSID Independent (PAME-BI) bit is used by an AP to indicate whether the Advertisement Server, which is the non-AP STA's peer for this Advertisement Protocol, returns a Query Response that is independent of the BSSID used for the GAS frame exchange. This bit is set to 1 to indicate the Query Response is independent of the BSSID; it is set to 0 to indicate that the Query Response may be dependent on the BSSID.
• the Advertisement Protocol ID field may be set to zero to indicate that the GAS message carries an ANQP query/response.
• FIG. 12 illustrates a table of ANQP elements that may be queried using an ANQP request message protocol.
• ANQP query request may use the Query List ANQP-element comprising ANQP- elements Info IDs that have an ANQP-element type of S.
• the ANQP query request is transported in the Query Request field of GAS Request frames.
• the ANQP query response is transported in the Query Response field of GAS Response frames.
• This disclosure proposes a new method to indicate the common ANQP attributes in a homogeneous extended service set identification (HESSID) and a query method to request the common attributes.
• a new type of query is proposed, where the query sender specifies if the sender wants to query only the dependent basic service set (BSS) parameters or both the dependent and the independent BSS parameters.
• the query request format proposed is the initial GAS request with Advertisement Protocol element (e.g., code 3) having an Advertisement Protocol ID set to zero and a PAME-BI bit set to either zero or one depending on whether independent BSS parameters are desired.
• Advertisement Protocol element e.g., code 3
• the responding STA (e.g., the AP) notifies the ANQP server that independent BSS parameters are being queried in addition to the dependent BSS parameters.
• This notification can be executed in a variety of ways.
• the responding STA may modify the ANQP query prior to forwarding the ANQP query to the ANQP server, e.g., append or embed the PAMI-BI bit in the ANQP query, etc.
• the responding STA may include an indication in a priority protocol message used to transport the ANQP query from the responding STA to the ANQP server.
• the PAME-BI bit may be embedded in the ANQP query by the requesting server prior to the ANQP query being encapsulated within the GAS message.
• Requesting STAs may adjust subsequent queries to other APs when independent
• BSS parameters are obtained via an ANQP/GAS exchange, thereby reducing the overhead of those subsequent queries.
• the BSSID dependent and independent parameters are located in the ANQP server.
• the server record keeps additional information for each ANQP attribute to specify if the attribute is BSSID dependent or not.
• the server distinguishes the BSS dependent from the BSS independent attributes by keeping additional information on each attribute, storing the information in separate data structure or other methods.
• the filtering based on the BSSID independent or not value may be done at the ANQP server level based on the GAS request format and BSSID value.
• Dependent and independent BSS attributes can be distinguished from one another in a variety of ways.
• the dependent and independent BSS attributes are listed in a single group of attribute fields, with each attribute field having an indicator (e.g., a PAME-BI indicator or otherwise) that specifies whether the corresponding BSS attribute is independent or dependent.
• dependent BSS attributes are listed in first group of attribute fields and independent BSS attributes are listed in a second group of attribute fields.
• the first and second groups of attribute fields may be differentiated using an indicator bit (e.g., PAM-BI bit or otherwise).
• dependent BSS attributes may be provided by the corresponding AP, and independent BSS attributes may be provided by the ANQP server.
• APs may only provide their own dependent BSS attributes.
• the dependent BSS attributes may be stored locally in the AP or remotely in the ANQP server.
• the ANQP may create a new entry for each BSSID.
• the ANQP server matches the AP address to a BSSID and then returns the corresponding attributes to the corresponding AP.
• ANQP records may be manually specified by the operator or dynamically updated by the AP during an initialization of the ANQP records.
• dependent and independent BSS attributes may be provided in separate ANQP response messages. The messages may have a different PAME-BI indicator value to indicate whether the message carries independent or dependent BSS parameters.
• multiple ANQP servers may be distributed at AP locations. In such embodiments, the ANQP servers may communicate and/or manage independent/dependent BSS parameters in a distributed manner. By way of example, the distributed ANQP servers may collectively determine which BSS parameters are dependent/independent.
• a distributed ANQP server at a first AP may decide that an independent BSS parameter should be changed to a dependent BSS parameter, and may inform other ANQP servers located at APs in the same homogeneous extended service set (HESS) as the first AP.
• sets of independent and/or dependent BSS parameters may be associated with a life time duration, in which case a STA may utilize a remaining lifetime (e.g., identified via ANQP protocol) to determine when to query updated BSS parameters.
• FIG. 13 illustrates a block diagram of an embodiment of a communications device 1300, which may be equivalent to one or more devices (e.g., UEs, Bs, etc.) discussed above.
• the communications device 1300 to communicate data or control information via a supplemental protocol.
• the supplemental interface 1312 may be a non-cellular wireless interface for communicating in accordance with a Wireless-Fidelity (Wi-Fi) or Bluetooth protocol.
• Wi-Fi Wireless-Fidelity
• Bluetooth Bluetooth protocol
• the supplemental interface 1312 may be a wireline interface.
• the backhaul interface 1314 may be optionally included in the communications device 1300, and may comprise any component or collection of components that allows the communications device 1300 to communicate with another device via a backhaul network.
• FIG. 14 is a block diagram of a processing system that may be used for
• the processing system may comprise a processing unit equipped with one or more input/output devices, such as a speaker, microphone, mouse, touchscreen, keypad, keyboard, printer, display, and the like.
• the processing unit may include a central processing unit (CPU), memory, a mass storage device, a video adapter, and an I/O interface connected to a bus.
• the video adapter and the I/O interface provide interfaces to couple external input and output devices to the processing unit.
• input and output devices include the display coupled to the video adapter and the mouse/keyboard/printer coupled to the I/O interface.
• Other devices may be coupled to the processing unit, and additional or fewer interface cards may be utilized.
• a serial interface card (not shown) may be used to provide a serial interface for a printer.

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• Computer Security & Cryptography (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2013
  • 2013-11-05 US US14/072,551 patent/US9480005B2/en active Active
  • 2013-11-06 CN CN201380056557.0A patent/CN104770020B/zh active Active
  • 2013-11-06 JP JP2015540041A patent/JP6055107B2/ja active Active
  • 2013-11-06 EP EP13853305.4A patent/EP2910064B1/de active Active
  • 2013-11-06 WO PCT/CN2013/086636 patent/WO2014071845A1/en not_active Ceased
  • 2013-11-06 KR KR1020157014338A patent/KR101688446B1/ko active Active
• 2016
  • 2016-10-20 US US15/298,468 patent/US9872238B2/en active Active
• 2017
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